Extension bit



Nov. 4, 1947. F, H. DRAGOO EXTENSION BIT Filed Jan. 8, 1945 2 Sheets-Sheet l f L f/QML/(W Nov. 4, 1947. F. H. DRAGOO EXTENSION BIT Filed Jan. 8, 1945 2 Sheets-Sheet 2 Patented Nov. 4, 1947 UNITED STATES PATENT OFFICE EXTENSION BIT 7 Bay H, Dragon, Farmingtonhw. Val

Application January 8, 1945, Serial No. 571,787

2 Claims. (Cl. 27989) This invention relates to an implement for removing cores from wooden poles, such as telegraph and electric light poles, and in the art is generally referred to as a pole line inspection tool where cores of the wood are removed to determine the degree of deterioration of the pole, and since the wood is more quickly affected at or below the ground line in which the pole is stationed, it is desirable to afford means by which cores can be removed from the pole in the zone of greatest deterioration. Hence, it is an object of this invention to provide an extension for the boring bit or auger by which the extension can be expeditiously installed in association with the bit and expeditiously disconnected when the bit has been driven to the desired depth in the pole; the said disconnection or removal of the bit extension facilitating the removal of the core which has been accumulated in the bit.

It is a further object of the invention to provide an extension with means at one end by which it is attached to a handle and with means at the opposite end by which it is removably coupled to the bit in order that the bit may be left in situ and an extractor manipulated to remove the core, after which the extension may be expeditiously replaced on the bit so that it may be backed out and removed from the hole.

With the foregoing and other objects in view which will appear during the description of the structural features of the extension, the invention consists in the details of construction, and in the arrangement and combination of parts to be hereinafter more fully set forth and claimed.

In describing the invention in detail, reference will be had to the accompanying drawings forming part of this application, wherein like characters denote corresponding parts in the several views, and in which:

Figure 1 illustrates a View in side elevation of an extension embodying the invention;

Figure 2 illustrates a sectional view of a part of the extension;

Figure 3 illustrates a view in elevation of the extension in a position at right angles to that shown in Fig. 1;

Figure 4 illustrates a top plan view of the extension;

Figure 5 illustrates a perspective view of details of the bit-holding part of the extension;

Figure 6 illustrates an end view of the exten sion for coupling it to the handle; I

Figure '7 illustrates a plan view of a bit coupling with the bit in section;

Figure 8 illustrates a view in elevation of the inner face of the bit coupling;

Figure 9 illustrates a sectional view of the coupling with the bit in elevation installed therein;

Figure 10 illustrates a view in elevation of another inner face of the bit coupling;

Figure 11 illustrates a detail view showing the bit and the detent engaging the bit; and

Figure 12 illustrates a sectional view of the bit coupling and other associated features.

In these drawings I denotes the shank and enlarged end of the extension, 2 a bit coupling having a socket to receive the end of the bit which is angular in cross section, the said coupling having a shoulder 2 which is engaged by a lug on the latch 3. At the inner end of the socket of the coupling a bifurcated detent 4 is slidably seated on flanges such as 4' to engage the inner end of the bit when it is applied to the socket of the coupling, it being obvious that the said detent is movable into place and removable also when the coupling is swung on a pivot 5 extending transversely of the enlarged portion of the shank. It is seen that the latch 3 is oscillatable on a pivot 6 extending through the shank near the outer end thereof, and the said latch is pressed into operative engagement with the shoulder 2' by a spring 1 engaging the tail of the latch, which spring is held anchored on the shank by a screw 8.

It is obvious from an inspection of the drawing and the foregoing description that when the coupling is swung on its pivot 5, the shank of the bit may be inserted in the socket and the detent 4 may be manipulated to retain it in place, after which the coupling may be swung to the position in which it is shown in Fig, 2 with the latch engaging the shoulder to retain the parts in different operative position until the boring operation is completed and thereafter the latch can be manipulated to release the shoulder 2' of the coupling and the shank then swun at a position at an angle to the bit, so that the coupling can be dislodged from the bit temporarily. In operation at this point, a wrench is usually used to back off the bit the necessary half turn to break the core, and when the extractor has been removed, the bit extension would again then be replaced on the bit and manipulated to back out the bit.

The bit 9 has a groove in which the detent slides for retaining the bit in the extension and it is obvious, as heretofore stated, that the detent can be moved to adjusted positions as illustrated in Figures 9 and 12. In Figure 9 it is shown as engaging the bit, and in Figure 12 as detached so that the bit can be removed.

I claim:

1. A holder for a, bit comprising a shank having means of connection to an operating element, the said shank having an enlarged end, a bit coupling pivotally mounted at one side on the last mentioned end, a latch on the said end for removably engaging the bit coupling, and means for removably holding the bit in the said coupling.

2. A holder for a bit comprising a shank having means of connection to an operating element, the said shank having an enlarged end, a member having a bit socket pivotally mounted at one side on the last mentioned end, a shoulder on the said member, a latch pivotally mounted onthe 4 end for removably engaging the shoulder, and a bifurcated detent slidable laterally of the enlarged end below the bit socket for engagement with a shank of the bit for retaining it seated.

FAY H. DRAGOO.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 455,477 Steward July 7, 1891 885,392 Spets Apr. 21, 1908 1,119,412 Donegan et a1. Dec. 1, 1914 1,413,101 Cushing Apr. 18, 1922 

